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E. SALTZKORN & L. NIGOLAI. .A'PPARATUSFOR PRBSSING 0R STAMPING ARTIGLES FROM WOOD PULP, &0.

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E. SALTZKORN & L. NIOOLAI. APPARATUS FOR PRESSING 0R STAMPING ARTIGLES FROM WOOD PULP, Gas

No. 529,753. Patented Nov. 27, 1894.

UNITE STATES PATENT, OFF CE.

YEMIL SALTZKORN AND .LUDWYIRG NICOLAI, on DRESDEN, GERMANY.

APPARATUS FOR PRESSING R STAMPING ARTICLES FROM WOOD-PULP, 8w.

SPECIFICATION forming part of Letters Patent No. 529,753, dated November 27, 1894.

Application filed December 13, 1893. Serial Ila- 493,558. (No model.)

To all whom it -may concern:

Be it known that we, hill/ IL SALTZKORN and 'LUDWIG' N ICOLAI', subjects of the Emperor of manufacture boxes or other articles on a stretching or stamping press from materials so constituted that they do not possess su'ffi-' cient strength to withstand the stretching strain to which they are subjected during the operation of the press, the materials which it is proposed to operate upon being wood or straw pulp board, inferior qualities of leather or certain kinds of sheet metal, &c., which at the present time cannotbe successfully operated upon by the stamping press owing to their inability to withstand the stre ching and friction to which they are subjected.

The present invention consists primarily in the employment of a protecting cap or projecting strips of paper, cloth, metal or other material of sufficient strength to withstand the stretching and frictional strains of the pressing or stamping machine, this protecting protecting cap. Fig. 3 is a similar view showing a cap with a portion of the material removed so as to form aseries of strips, radiating from a central body portion. Fig. 4 is a similar. View illustrating a protective cap made up of a number of separate radiating strips. Fig. 5 is a similar view showing the employment of separate strips each strip being of such a width that when all are at a right angle to the lower face of the die, their edges will meet, andform a complete cup. Fig.6 is a similar view showing the arrangment of strips when a box or other. article of oval or elliptical shape is to be manufactured,'and Figs. 7, 8, 9, l0 and 11 are similar views showing various methods of arranging the strips for the manufacture of boxes or other articles of square or rectangular form. v

Referring'to the drawingsA represents a die of suitable construction its form in'cross with the die, A, and the mold to form the article.

D represents a protective cap madeof strong and preferably elasticor flexible material such as cloth, paper or rubber orthe like and centhe cap is held in place by a plate, 0, screwed or otherwise united to the upper end of the counteracting stamp, C. With the parts in the position shown in Fig. 1 the sheet of maw terial to be acted upon is placed on top of the protective cap and on top of the sheet 1s placed the usual friction ring, 61, which acts,

'in a manner, to hold the material and cap and prevent too rapid feeding as the die descends.

On the entrance of the die into the mold the protective cap takes all the stretching'and frictional strain, and distributes it overthe entire surface of the material under treatment, avoiding all danger of tearing of the material as it is forced into the mold, the cap entirely surrounding the material and being pressed into intimate contact with the face of the mold, as shown by dotted lines in Fig.

1. In lieu of the protecting cap or disk a series of strips, D, such as that shown in Figs. 3 to 11 inclusive. may be employed, the arrangement of strips being to some extent dependent upon the character of material under treatment but in all cases being so arranged as to distribute the stretching strain and friction over a large area of the material being acted upon. These strips if of metal are preferably of soft steel or other similar material which may be acted upon by the die and again bent out without fracture for a considerable length of time or where flexible material is employed the outer end of each strip may be connected by an elastic cord or strip to a fixed point, say at the edge of the mold so that as the counteracting stamp moves upward to discharge the article whicn has been manufactured the strips will all be turned out in a horizontal position in readiness to receive a fresh sheet of the material to be acted upon or the strips themselves may be made of elastic material or their outer ends may be weighted if desired. The cap or disk or the strips might also be made of spring metal, which, after the return of the counteracting stamp will reassuine its normal horizontal position in readiness for the next operation.

In practice we have found the employment of separate strips-to be more desirable than the employment of a cap or disk which will completely cover the material being acted. upon inasmuch as the cap will occupy more" space when pressed into the mold than will the strips and strips may be arranged only at such points as are subjected to the greatest strain such as at the corners of square or angular boxes or at the ends of oval or elliptical boxes and the width and position of the strips may be such that when in the die they will form a cover which will entirely. sur-.

round the material being acted upon when in the mold and will press the latter into intimate contact with the die as shown in Fig. 5. Moreover when strips are used they may be readily interchanged and if one be broken it may be readily replaced, or the operation continued without it.

The arrangements of strips shown in Figs.

7 to 11, illustrate separate strips disposed in such manner as to meet various requirements, when the materal is to be protected at given points.

In Fig. 9 the strips are arranged in groups, each group having a common base from which the strips extend.

When the boxes or other articles being manufactured are of oval or hexagonal or other form the die and mold are of course, shaped correspondingly.

With a protective device of this character we are enabled to manufacture boxes and other articles from material possessing small tensile strength and can act with safety upon all kinds of paperboard or Wood or strawboard, leather or other material and manufacture the required box or other articles without injuring or breaking or tearing the material.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is-

1. Inastamping machine,a mold, an inner outer walls of the plunger and theinner walls of the mold, substantially as described.

2. In a forming machinein combination ;with the mold and plunger, a flexible fabric provided upon the upper face of themold and an inner vertically adjustable die operating as a support for that portion of the Iflexible fabric between the lower face of the plunger and the upper face of the inner die in the descent of the plunger and retaining ring provided upon the upper face of the :mold above the fabric and upon the material 130 be shaped, substantially as described.

' 3. In a forming machine the combination 10f a die or plunger, a mold, a counteracting stamp or inner die adj ustably provided within said mold and strips of flexible fabric secured to said inner die, said flexible strips constructed to cling to the walls of the mold and to conform to the lines of the walls of the mold as the plunger is depressed and to form a yielding body for the material to be compressed between the walls of the plunger and the inner walls of the mold during the compressing operation, substantially as described.

4. The combination of the die, mold,counteractiug stamp therein, a series of radiating flexible strips secured to such counteracting stamp and adapted in the pressing operation to conform to the lines of the walls of the EMIL SALTZKORN. LUDWIG NICOLAI.

l \Vitnesses:

HERNANDO DE So'ro, BUD. SHM'ID'I. 

